cmp body work

[Phil Waterman]

Originally posted by Ken Hughes
Hi Phil you are doing a wonderful job there on your cab.
what i have found this week is that there is a difference between 13 cabs where the top back panel joins the roof
someone has told me that ford cabs are seam welded
and chev are spot welded, any thoughts on this?

Hi Ken - You are correct as far as my knowledge of Chevy CMPs all I have seen are pinch spot welded. When I re-skinned the back of my Pat 13 C60S I did not have a pinch spot welder so instead I punched ¼ holes and plug welded with the Mig. Whether you are using pinch spot weld or Mig plug weld it is critical to make sure that the both surfaces are bright shinny bare metal, if not the welds will brake from the vibration and rattle like hell. (I learned the hard way trying to re-pinch weld the window rain gutters on the Pat 13 without removing and grinding them bare. The welds held for about a 1000 miles and then the rattle started. Had to remove them completely and do them over.)